Expression question

I need to control the opacity of the stroke parameter within a shape layer. The shape layer contains 36 stroked shapes, and I have 5 of these shape layers, it's a lot of expressions to set up.

I set up a null with an expression slider to which I can link the parameter. I realize that the ideal way to do this would would have been to set one up and then duplicate it. Had I the forsight, oh if only! So is there a way to link the opacity parameter of all these shapes at once?

[Robyn Rhodes]"I realize that the ideal way to do this would would have been to set one up and then duplicate it."

if I properly understand what you're doing, you would have been faced with altering the shapes, which could be a very daunting task. I think it would be much tougher and time-consuming than just doing a simple pick-whip expression to that null's opacity property.

I'm doing just that now. Pick whipping. I was trying to avoid doing it 216 times. They are all circles. The AD's want to see want to see what they would look unstroked. I should have anticipated this. Live and learn.

Just to flesh out my particular situation for anyone else who may try to follow along here. I had to twirl down each object in the shape layer, showing Ellipse Path, Stroke 1, Fill 1, Transform. Then I command selected the Stroke 1 parameter(not really a parameter as it only has an eyeball) for each object in the shape layer. Then I was able to paste the expression in. And by the way it's just "paste". There's no "Paste Expression" corollary to "Copy Expression"